1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Basic electrostatics (geometry help)

  1. Sep 23, 2011 #1
    Here's the problem: http://i.imgur.com/dS7ZH.jpg

    I don't understand why the cosine has to be there. My geometry is a bit rusty, but wouldn't it be enough without the cosine part?
     
  2. jcsd
  3. Sep 24, 2011 #2

    NascentOxygen

    User Avatar

    Staff: Mentor

    E is the vector sum of the 4 E's. The vertical component of each Eo at the point of interest is cancelled out by the vertical component there due to an identical charge at one other vertex, leaving only horizontal components to be added. The cos gives you that horizontal component of each E.
     
  4. Sep 24, 2011 #3
    Ah, you're right. Thanks!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Basic electrostatics (geometry help)
  1. Basic python help? (Replies: 1)

Loading...